[cobirds] Bald Eagle pair, Pierce, Denver County

[Tina Jones]

Hi all,
I have been watching the Bald Eagle pair and nest , next to the American Water 
Works buildings, for several months. The nest is actually on the property of 
Marston Reservoir, and right off of and next to, Pierce St. This year nest was 
new and built by a different pair of Eagles than the nest before [which blew 
down from a rotten Cottonwood branch a couple of years ago]. This story is 
rather typical in that the nest I had been watching for several months was 
built on top of one large dead branch also. I dreaded the day if these Eagles 
had 2 young knowing the weight would probably trigger the dead branch to break.

The male and female started to incubate 3/3, I believe from watching their 
behavior.

I can see the nest from my house and have periodically looked at it with 
binoculars. I have gone over to watch the Eagle behavior for weeks. I did not 
go over to view the nest on Saturday, 4/3 or on 4/4. On Sunday 4/4 I watched 
the nest from my house. The female bird, I believe, was standing up almost 
straight and the bird was looking down towards the center of the nest, while 
this bird bobbed it's head up and down a bunch. There was no other adult to be 
seen. The behavior looked odd to me and I could not go to see the Eagles on 
4/4. I went Monday, 4/5 and there were no Eagles to be seen anywhere even after 
waiting for around 2 and a half hours. The birds were not there 4/6. On 4/6 
there were around 13 Magpies sitting in the tree where the Eagles had nested, 
and they were looking casually at the nest. 5  Crows appeared and sat where the 
magpies had left. None of the previous predators jumped into the nest.

I do not know if the egg/s were infertile or what happened. April 5 had been a 
couple of days after when the egg/s should have hatched. If anyone was at the 
nest on 4/3 or 4/4, and you saw some interesting behavior I would love to know. 
I do know that the male was meticulous in that he rearranged the sticks on the 
nest every time it was his time to incubate. She never did. There was lot's of 
bill scraping and much more bill grabbing than I have seen in other Balds

Thanks!
Tina Jones
Littleton, Jefferson County, CO

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Re: [cobirds] Rigden Reservoir (Larimer) today

[Charles Hundertmark]

I recall a similar midge hatch many years ago at MacFarlane Reservoir in North 
Park. It was impossible to open the truck door without being swarmed by the 
critters and when you walked it was difficult to avoid inhaling them. I did not 
count the number of species feasting on the hatch, but swallows were feeding in 
the air; California Gulls were devouring them both on the water surface and on 
the dam; and Eared Grebes and several species of duck were sweeping them from 
the surface of the lake. It was unforgettable.

Chuck Hundertmark
Lafayette, CO

> On Apr 6, 2021, at 7:26 PM, DAVID A LEATHERMAN  wrote:
> 
> I visited Rigden Reservoir on this rather cool, progressively deteriorating 
> weather day.  Best birds were peregrine falcon flyover at 7:30am, one lesser 
> yellowlegs, grebes (horned, eared and pied-billed), both grackles, heard only 
> Virginia rail, flock of tree swallows, FOY for me barn swallow, yellow-headed 
> blackbirds, Savannah sparrow, and about a half dozen Franklin's gulls.
> 
> But to me the best thing was the bird response to a food "happening".  
> Chironomid midges, those mosquitolike insects that buzzily swarm in front of 
> you on the trail, were emerging and being deposited on the south shore by the 
> increasingly strong north winds.  Like an arthropod version of D-Day, larvae 
> (aka "bloodworms"), pupae and adults wriggled and wiggled on the small pebble 
> beach.  Here is a list of the 23 bird species eating them in the air 
> (adults), out on the water as they emerged (adults and rising pupae), but 
> mostly where concentrated along the south shore (larvae, mostly pupae, 
> adults): Gadwall, Mallard, Pied-billed Grebe, Eared Grebe, Horned Grebe, 
> Killdeer, Greater Yellowlegs, Lesser Yellowlegs, Franklin's Gull, Ring-billed 
> Gull, California Gull, Herring Gull (maybe), Horned Lark, Tree Swallow, Bark 
> Swallow, American Robin, European Starling, Savannah Sparrow, Yellow-headed 
> Blackbird, Western Meadowlark, Red-winged Blackbird, Common Grackle, 
> Great-tailed Grackle.  Don't recall seeing that many species of birds eating 
> the same thing at one site before.
> 
> Photos (from top to bottom): adult midge (not taken today and probably a 
> difference species than that shown in the pupal photo but just to give an 
> idea of their body style & general appearance), midge pupae present today at 
> Rigden, yhblackbird at water's edge with pupa, close-up of yhblackbird with 
> pupa in beak, ring-bills on the beach (they were getting midges out in the 
> water where they occurred at a density of 1 per square foot and then decided 
> to try the beach where midges were 5 per square inch).
> 
>   
> 
>   
> 
>   
> 
>  midges RigdenRes 117A1886ecs.jpg>
> 
> Dave Leatherman
> Fort Collins
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Re: [cobirds] Possible Slaty-backed Gull, Larimer

[Dave Cameron]

Thanks, Nick, for the explanation.  And, it saves me a trip!  

- Dave Cameron

On Tuesday, April 6, 2021 at 5:27:39 PM UTC-6 Nick Komar wrote:

> Sorry I meant to follow up. I read up on first-cycle Slaty-backed Gull 
> Identification. While this bird looked similar, a couple features in 
> particular ruled out Slaty-backed Gull. The outer wing (a.k.a. the hand) 
> was long like Herring and Glaucous-winged, rather than short. Also the bill 
> was very long with the curvature of the culmen well anterior to the 
> nostrils. In Slaty-backed, the bill is short with the curvature beginning 
> over the nostrils. Therefore I concluded that this bird was not 
> Slaty-backed but rather a hybrid Gw x herring. This hybrid combo is 
> becoming more frequent among our winter gulls, and is well known to appear 
> similar to slaty-backed gull in first cycle plumages. 
>
> I have been keeping an eye on the Larimer gull flock and have not seen 
> this bird again. 
>
> Nick Komar
>
> On Apr 6, 2021, at 4:48 PM, Dave Cameron  wrote:
>
> Has anyone had occasion to go search for this bird since the 28th?  Any 
> info as to whether it's still around would be appreciated.  Thanks!
>
>
> Dave Cameron
> Denver
>
> On Sunday, March 28, 2021 at 10:32:50 PM UTC-6 colima...@gmail.com wrote:
>
>> Most lariphiles agree some first cycle pale-headed gulls are 
>> challenging.  So much variation. 
>> Can you you elaborate on those “checked boxes” you mention?  
>>
>> Bruce Webb
>> Former Boulder resident 
>>
>> On Sun, Mar 28, 2021 at 11:42 AM Nicholas Komar  
>> wrote:
>>
>>> A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland 
>>> (Larimer) seems to check most boxes for Slaty-backed Gull. See photos 
>>> below. Warning: this age/species combo is very difficult to confirm so may 
>>> not get confirmed in eBird or accepted by a records committee. But wanted 
>>> to share to give folks an opportunity to look for it. 
>>>
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>>> .
>>>
>>>
>>>
>>>
>>> Nick Komar
>>> Fort Collins CO
>>>
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>>> .
>>>
>> -- 
>> Bruce Webb
>> Granite Bay, California
>>
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> .
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Re: [cobirds] Possible Slaty-backed Gull, Larimer

[Nicholas Komar]

Sorry I meant to follow up. I read up on first-cycle Slaty-backed Gull 
Identification. While this bird looked similar, a couple features in particular 
ruled out Slaty-backed Gull. The outer wing (a.k.a. the hand) was long like 
Herring and Glaucous-winged, rather than short. Also the bill was very long 
with the curvature of the culmen well anterior to the nostrils. In 
Slaty-backed, the bill is short with the curvature beginning over the nostrils. 
Therefore I concluded that this bird was not Slaty-backed but rather a hybrid 
Gw x herring. This hybrid combo is becoming more frequent among our winter 
gulls, and is well known to appear similar to slaty-backed gull in first cycle 
plumages. 

I have been keeping an eye on the Larimer gull flock and have not seen this 
bird again. 

Nick Komar

> On Apr 6, 2021, at 4:48 PM, Dave Cameron  wrote:
> 
> Has anyone had occasion to go search for this bird since the 28th?  Any info 
> as to whether it's still around would be appreciated.  Thanks!
> 
> Dave Cameron
> Denver
> 
>> On Sunday, March 28, 2021 at 10:32:50 PM UTC-6 colima...@gmail.com wrote:
>> Most lariphiles agree some first cycle pale-headed gulls are challenging.  
>> So much variation. 
>> Can you you elaborate on those “checked boxes” you mention?  
>> 
>> Bruce Webb
>> Former Boulder resident 
>> 
>>> On Sun, Mar 28, 2021 at 11:42 AM Nicholas Komar  wrote:
>>> A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland 
>>> (Larimer) seems to check most boxes for Slaty-backed Gull. See photos 
>>> below. Warning: this age/species combo is very difficult to confirm so may 
>>> not get confirmed in eBird or accepted by a records committee. But wanted 
>>> to share to give folks an opportunity to look for it. 
>>> 
>> 
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>>> 
>>> 
>>> 
>>> 
>>> Nick Komar
>>> Fort Collins CO
>>> 
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>> -- 
>> Bruce Webb
>> Granite Bay, California
> 
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Re: [cobirds] Possible Slaty-backed Gull, Larimer

[Dave Cameron]

Has anyone had occasion to go search for this bird since the 28th?  Any 
info as to whether it's still around would be appreciated.  Thanks!

Dave Cameron
Denver

On Sunday, March 28, 2021 at 10:32:50 PM UTC-6 colima...@gmail.com wrote:

> Most lariphiles agree some first cycle pale-headed gulls are challenging.  
> So much variation. 
> Can you you elaborate on those “checked boxes” you mention?  
>
> Bruce Webb
> Former Boulder resident 
>
> On Sun, Mar 28, 2021 at 11:42 AM Nicholas Komar  
> wrote:
>
>> A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland 
>> (Larimer) seems to check most boxes for Slaty-backed Gull. See photos 
>> below. Warning: this age/species combo is very difficult to confirm so may 
>> not get confirmed in eBird or accepted by a records committee. But wanted 
>> to share to give folks an opportunity to look for it. 
>>
>> -- 
>> -- 
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>> Include bird species and location in the subject line when appropriate
>> * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/
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>> .
>>
>>
>>
>>
>> Nick Komar
>> Fort Collins CO
>>
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>> .
>>
> -- 
> Bruce Webb
> Granite Bay, California
>

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[cobirds] Dinosaur Ridge - Denver Field Ornithologists (06 Apr 2021) 23 Raptors

[reports]

Dinosaur Ridge - Denver Field Ornithologists
Colorado, USA
Daily Raptor Counts: Apr 06, 2021
---

SpeciesDay's CountMonth Total   Season Total
-- --- -- --
Black Vulture0  0  0
Turkey Vulture   2 13 16
Osprey   0  0  0
Bald Eagle   0  2 15
Northern Harrier 0  0  0
Sharp-shinned Hawk   0  6 20
Cooper's Hawk5 18 29
Northern Goshawk 1  2  6
Red-shouldered Hawk  0  0  0
Broad-winged Hawk0  1  1
Red-tailed Hawk  7 43236
Rough-legged Hawk0  0  1
Swainson's Hawk  2  2  2
Ferruginous Hawk 1  1  7
Golden Eagle 0  0  6
American Kestrel 5 14 16
Merlin   0  0  4
Peregrine Falcon 0  0  4
Prairie Falcon   0  0  1
Mississippi Kite 0  0  0
Unknown Accipiter0  0  1
Unknown Buteo0  2 11
Unknown Falcon   0  0  2
Unknown Eagle0  0  0
Unknown Raptor   0  0  3

Total:  23104381
--

Observation start time: 08:30:00 
Observation end   time: 13:15:00 
Total observation time: 4.75 hours

Official Counter:Carol Cwiklinski

Observers:

Visitors:
There were bikers, hikers and dog walkers on the trail today. I had no
visitors to observation.


Weather:
The day started out with a clear blue sky. Gradually storms developed from
the north.

Raptor Observations:
Raptors were migrating today, but sometimes just a few in an hour. It is
likely the cloudless skies made it more difficult to see them, as evidenced
by the count in the final hours. American kestrels were especially
difficult to locate, often flying high and east of the ridge.
The 1200-1300 hour I witnessed a push of birds likely due to the storms.
All the raptors during this hour were eye level at the ridge, except for
the Swainson’s Hawks which were spotted at limit of unaided eye.

Non-raptor Observations:
Violet green swallows, Mountain Bluebirds, White throated swifts.

Report submitted by DAVID HILL ()
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
http://www.dfobirds.org


More site information at hawkcount.org:  
https://hawkcount.org/siteinfo.php?rsite=123

Site Description:
Dinosaur Ridge is the only regularly staffed hawkwatch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Dinosaur
Ridge may be the best place in the country to see the rare dark morph of
the Broad-winged Hawk (a few are seen each spring). Hawkwatchers who linger
long enough may see resident Golden Eagles, Red-tailed Hawks and Prairie
Falcons, in addition to migrating Swainson's, Cooper's and Sharp-shinned
Hawks, American Kestrels and Turkey Vultures. Peregrine Falcons and
Ferruginous Hawks are uncommon; Northern Goshawk is rare but regular.
Non-raptor species include Rock Wren, and sometimes Bushtit, Western
Bluebird, Sandhill Crane, White-throated Swift, American White Pelican or
Dusky Grouse. Birders of any skill level are always welcome.  HawkWatch at
Dinosaur Ridge is generally staffed by volunteers from about 9 AM to around
3 PM from March 1st to May 7th.

Directions to site:
>From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow small signs from
the southwest end of lot to the hawkwatch site. The hike starts heading
east on an old two-track and quickly turns south onto a trail on the west
side of the ridge. When the trail nears the top of the ridge, turn left,
head through the gate, and walk to the clearly-visible, flat area at the
crest of the ridge.  (Distance: 0.56 miles, Elevation gain: 259 feet)


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[cobirds] Sad News from Barr Lake, Adams County

[Brian Johnson]

I learned last night that the tree that was holding 

 
the Bald Eagle Nest at Barr Lake fell. The nest was destroyed and the 
eaglets died. Park Rangers hope to put the basket up in another tree later 
this summer.
Such things happen naturally in nature, but still it's sad.

Brian Johnson
Englewood CO

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